INCI: Butylene Glycol
A diol – solvent and humectant, milder than propylene glycol. Close in properties to butylene glycol. Pregnancy-safe.
Topical application
BLimited evidence. One RCT or several controlled studies with limitations.
Functional diol humectant. Safety confirmed by CIR.
1,3-Butanediol is a four-carbon diol. The INCI name is usually Butylene Glycol. A clear liquid miscible with water. In cosmetics it works as a solvent, humectant and preservative booster (lowers water activity to help preservatives). Often part of toner, essence and lotion bases. Use levels run from 1 to 10%. Pregnancy safety. CIR confirms safety. Skin profile. Low irritation and allergen potential. Non-comedogenic. Suitable for all skin types.
Irritation potential
LowAllergen risk
LowPregnancy
SafeSuitable for
Butylene Glycol (1,3-Butanediol) is considered safe during pregnancy at typical cosmetic concentrations. Systemic absorption through the skin is minimal.
Butylene Glycol (1,3-Butanediol) suits: normal, dry, combination, oily, sensitive.
A diol – solvent and humectant, milder than propylene glycol.
On the Fulton scale 0/5 – non-comedogenic. For acne-prone skin, a rating of 3 or higher suggests choosing an alternative.
The INCI name is Butylene Glycol. It may also appear as: 3-Butanediol, 1,3-Butanediol, 1,3-Butylene Glycol.
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